c为144（1,2,3,4,6,8,9,12,16,18,24,36,48,72,144）
a为72（1,2,3,4,6,8,9,12,18,24,36,72）
b为216（1,2,3,4,6,8,9,12,18,24,27,36,54,72,108,216）
a+b+c=432